Event-shape-engineering study of charge separation in heavy-ion collisions

  • Recent measurements of charge-dependent azimuthal correlations in high-energy heavy-ion collisions have indicated charge-separation signals perpendicular to the reaction plane, and have been related to the chiral magnetic effect (CME). However, the correlation signal is contaminated with the background caused by the collective motion (flow) of the collision system, and an effective approach is needed to remove the flow background from the correlation. We present a method study with simplified Monte Carlo simulations and a multi-phase transport model, and develop a scheme to reveal the true CME signal via event-shape engineering with the flow vector of the particles of interest.
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Fufang Wen, Jacob Bryon, Liwen Wen and Gang Wang. Event-shape-engineering study of charge separation in heavy-ion collisions[J]. Chinese Physics C, 2018, 42(1): 014001. doi: 10.1088/1674-1137/42/1/014001
Fufang Wen, Jacob Bryon, Liwen Wen and Gang Wang. Event-shape-engineering study of charge separation in heavy-ion collisions[J]. Chinese Physics C, 2018, 42(1): 014001.  doi: 10.1088/1674-1137/42/1/014001 shu
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Received: 2017-10-25
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    Supported by a grant (DE-FG02-88ER40424) from U.S. Department of Energy, Office of Nuclear Physics

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Event-shape-engineering study of charge separation in heavy-ion collisions

  • 1.  Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
  • 2.  Department of Physics, University of California, Berkeley, California 94720, USA
Fund Project:  Supported by a grant (DE-FG02-88ER40424) from U.S. Department of Energy, Office of Nuclear Physics

Abstract: Recent measurements of charge-dependent azimuthal correlations in high-energy heavy-ion collisions have indicated charge-separation signals perpendicular to the reaction plane, and have been related to the chiral magnetic effect (CME). However, the correlation signal is contaminated with the background caused by the collective motion (flow) of the collision system, and an effective approach is needed to remove the flow background from the correlation. We present a method study with simplified Monte Carlo simulations and a multi-phase transport model, and develop a scheme to reveal the true CME signal via event-shape engineering with the flow vector of the particles of interest.

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